Abstract

Spatially resolved photothermal scanning imaging of metallic samples using the photopyroelectric (P²E) effect is reported. Unlike that for conventional photothermal detection, the new instrumentation involves polyvinylidene fluoride (PVDF) thin pyroelectric film and a metal-tip detection geometry, which permits monitoring of the local values of the laser-induced diffractive and/or interferometric thermal-wave field in a sample. The effects of the relative PVDF surface-tip position, of the laser beam modulation frequency, and of the presence of subsurface defects in the sample on the spatial resolution of the P²E images are examined.

© 1990 Optical Society of America

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